SharkTuner Topics

The JDS Porsche SharkTuner for the Porsche 928 allows the optimization of the fuel and ignition maps to ensure optimum performance from the engine. This is particularly important if the engine has been modified in any way e.g. change of exhaust system or a supercharger.

The original SharkTuner Mk1 connected via a “ribbon cable” to the ECU for 85/86 928s. The SharkTuner-2 for 87+ replaces the original EPROM’s with programmable memory modules (“PEM’s”) and connects via the diagnostic connector. This page covers the SharkTunerMk-2, for info on the SharkTuner Mk1 see this page.

The SharkTuner-2 (ST2) is a hardware interface between the LH ECU (fuel injection computer) and/or the EZK ECU (ignition computer) and a laptop computer. Programmable memories (PEM’s) replace the factory ROM chips, a slave microcontroller in the SharkTuner acts as an interface between a laptop computer and the ECU’s, and a custom Windows program running in the laptop provides access to both the LH2.3 and EZK ECU’s for real-time diagnostics, adjustments, and data logging. For tuning, a wideband-O2 (WBO2) sensor is required to provide a measurement of the air/fuel ratio (AFR). The SharkTuner is powered by the diagnostic connector fitted to all 87+ 928s. The WBO2 controller can be powered from the factory NBO2 sensor connector or a specially-wired connection.

Sirius Cybernetics LLC (Jim Corenman) handles SharkTuner sales and support. We are also the developers of the Sharkplotter software, which allows post-processing SharkTuner log files to update fuel and ignition maps– no longer do you need to drive with one hand on the keyboard and the other on the wheel. Clock here for information about Sharkplotter software.

Sharktuner-2 complete with a connecting cable for ’87+ (S4 and later) 928’s, and one set of PEM’s (programmable memory modules) is $990.00 plus shipping (see the order page). This, and a WBO2 sensor/controller, are all you need to diagnose and tune the LH and EZK.

Extra PEM programmable memory modules for 87+ cars are $200 per set of two, one each required for the LH and EZK.

PEM’s can be supplied pre-loaded for S4, GT or GTS (please specify) and can be installed without a Sharktuner, to make your car “Sharktuner-Ready”.

The Sharktuner-2 user manual can be found on the Sharktuner Downloads page.

We have also done some introduction and how-to video’s which are available on youtube, click here

And please read the manual first, it will make everything much more clear!

Happy tuning!